diff --git a/lib/stripe/api_operations/delete.rb b/lib/stripe/api_operations/delete.rb
index 4068771f..36a3cb8e 100644
--- a/lib/stripe/api_operations/delete.rb
+++ b/lib/stripe/api_operations/delete.rb
@@ -3,7 +3,7 @@ module Stripe
     module Delete
       def delete(params = {}, opts={})
         api_key, headers = Util.parse_opts(opts)
-        response, api_key = Stripe.request(:delete, url, api_key, params, headers)
+        response, api_key = Stripe.request(:delete, url, api_key || @api_key, params, headers)
         refresh_from(response, api_key)
       end
     end